A grain dryer

Abstract

The invention relates to a grain dryer. An inner cavity of a drying tower of the grain dryer comprises a feeding bin and a multi-stage drying bin and tempering bin alternate arrangement structure from top to bottom, a discharging bin is arranged below a tempering bin on the lowermost layer, hollow partitioning plates are arranged inside drying bins, cavities of the hollow partitioning plates are ventilated, grain passes through the gap between every two adjacent hollow partitioning plates, through holes are formed in the faces of the hollow partitioning plates, air channels comprise hot air channels and secondary hot air channels, hot air is transmitted layer by layer between the drying bins from bottom to top through hot air conveying pipelines, and in the drying bin on each layer, the hot air passes through the through holes in the corresponding hollow partitioning plates from the corresponding hot air channels to permeate into material channels and then permeates into the corresponding secondary hot air channels to enter the drying bin on the upper layer. The grain is dried inside the drying tower in a clockwise or anticlockwise mode, heat exchange is performed between the high-temperature hot air and the grain high in water content and low in temperature, the temperature of the grain is increased rapidly to evaporate water inside, the grain enters the tempering bins to be tempered for a period of time after being dried, the water inside the grain permeates outwards, next-time drying is performed, and evaporation of the water inside the grain is completed in a gradient mode.

Description

technical field [0001] The invention relates to the field of drying equipment, in particular to a grain dryer utilizing the principle of forward and countercurrent drying. Background technique [0002] The basic basis for selecting grain drying conditions is the original moisture content of the grain, harvesting method, maturity and use of the grain. The greater the original moisture content of grain, the worse its thermal stability, that is, its heat resistance. There is no fully mature grain, and its temperature resistance is worse than that of mature grain. For newly harvested high-moisture grains, due to the uneven maturity and moisture content of the grains, the surface of the grains has not yet fully hardened. Therefore, lower temperature drying conditions should be used; if high-temperature drying conditions are used, the grains will be damaged instead, resulting in The surface of the grain is hardened, so that the capillary on the surface of the grain is greatly da...

AI Technical Summary

Problems solved by technology

When high-temperature hot air meets the wettest and coldest grains, it needs to use high-temperature hot air at 200 to 285 degrees. Although it is relatively cross-flow drying, the drying speed is fast, the unit heat consumption is low, and the efficiency is high, but it will affect the drying quality of grains. impact, causing grain damage

The hot air of the counter-current dryer is opposite to the direction of the grain flow. When the hot air enters the dryer, what it touches is no longer the wettest and coldest grain, but the grain that has been dried and has a certain temperature. Dry

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